The job
An integrated-handle tool for matching SC-S and AC-H six-notch cartridge-cup fittings.
Park Tool · Bottom-bracket cup tool
Park Tool BBT-4 Cartridge Bottom Bracket Tool
An integrated-handle tool for matching SC-S and AC-H six-notch cartridge-cup fittings.
$22.08Nov 7, 26, 12:53 AM · New York
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- Cup fitting Six-notch SC-S / AC-H cartridge cups
- Contact diameters 44 mm nominal major; 38 mm minor
- Handle Integrated, vinyl-coated
Cup fitting
Six-notch SC-S / AC-H cartridge cups
Confirm the legacy interface
Identify SC-S/AC-H and the six-notch pattern on the cup. A Campagnolo label elsewhere on the drivetrain is insufficient.
What this choice changes
A handled tool for legacy six-notch cartridge cups
The BBT-4 is worth considering when servicing an older cartridge bottom bracket with the six-notch SC-S or AC-H fitting. It addresses a specific legacy interface, rather than general Campagnolo cup service. Park Tool names matching Veloce, Xenon, Mirage, Daytona and Avanti applications, so the actual cup should decide the purchase.
Its nominal major diameter is 44 mm and minor diameter is 38 mm, but six notches are a defining part of the fit. A 16-notch tool with a similar outside size cannot be selected from diameter alone. The vinyl-coated handle is already part of the tool, removing the need to choose a separate socket-driving handle for this operation.
If you maintain several bicycles, buy for the cup you have rather than trying to make one handle cover unrelated standards. A separate retaining accessory can be considered only where the BBT-RS instructions list the actual configuration; it is not supplied with the BBT-4.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Cup fitting | Six-notch SC-S / AC-H cartridge cups |
| Contact diameters | 44 mm nominal major; 38 mm minor |
| Handle | Integrated, vinyl-coated |
| Named examples | Matching Campagnolo Veloce, Xenon, Mirage, Daytona and Avanti cups |
| Supplied | One handled BBT-4 |
Choose for your actual setup
Confirm the legacy interface
Identify SC-S/AC-H and the six-notch pattern on the cup. A Campagnolo label elsewhere on the drivetrain is insufficient.
Compare pattern before diameter
The BBT-9 and BBT-4 are not interchangeable just because their nominal outer dimensions are similar.
Fit checks & limits
- Only the matching cup interface is covered; not every Campagnolo bottom bracket.
- No torque-measuring function or universal tightening value is established.
Questions before you choose
Can I use it on a 16-notch 44 mm cup?
No. The six-notch contact is different. Use the tool that matches the complete cup geometry.
Do I need a ratchet?
The BBT-4 has its own manual handle. It is not described as a square-drive socket.
Will this fit every Veloce bottom bracket?
Choose by the actual six-notch SC-S/AC-H cup. A groupset name can cover different components or generations.
Guides for this choice
Other equipment to consider
Selected listing details, manufacturer information and source images were compared. No hands-on trial or universal fit is claimed. Product identifier: B000C3BCTS.